Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6923948c9439b00…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 20:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d588ecce21c29a40dc452c23265469d4 SHA-1: fa0cd1bfd8a7b1a40f0fce8ca4afc2d1cd738530 SHA-256: a6923948c9439b008ae28feb16f0c4c7ace408e716b27319ad9fa917ac3e1bac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://autavrabek.cz/obrazky/file/wifunijaxobomifomovel.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c04ec92c68---8262700053.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/pewitisonoriwapusexesak.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607570d7cbfd1---lagimo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611430117070c---wozupizofesew.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/80049697932.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/53480614870.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/93580729644.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ed374drq5mufra4q7ao8s27o06/wigetalogupemozasidukixij.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/256drv7eiit61mfot6d2ag1hm4/96039407864.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1dc4e6ce---46058312821.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/larexezesikepelapid.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161013461cb7fa---69354415632.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95155d20a9---kafolezojifarazukoxokufi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9426555ca33a9299a6ecec99e8044fb0/wulukuregenunotewizasarog.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4edb3a2899---fevaxowezazufila.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/44166174006.pdfIn PDF document text
    • http://gdaniec.com/upload/files/pugumopol.pdfIn PDF document text
    • http://gptools.net/userfiles/file/44480365775.pdfIn PDF document text
    • http://ibb-online.ru/f/file/99655103737.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/85421215695.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2ccdc76---jabasutesitet.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h01m28frvaesnm926dimh8f8jf/74837586822.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2f2668da3d173f0d48c4b6b87ea9783c/samedofazilidamiguzalaluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fiche+m%C3%A9tier+expert+comptable+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 10984 bytes
SHA-256: 5bd6086939666669df79ccb3d5218837910266332728e71c1f0952ff20832ce2
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 19524 bytes
SHA-256: 8cd27a1f7d78b8c7a2545488423123cd301e07734f2388dc832cb38e315242d6
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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